Hey I just picked back up King's Field 4 after stopping an initial run roughly a year and a half ago. Tbh I don't have a really good mental headspace of the layouts since getting back into the game, which may complicate things.

I'm Lv43 and am above the Old Battlefield in the circular Altar of Water area below Level 1. The water in the area is STILL POISONED.

https://preview.redd.it/8f42pc4pzq261.png?width=1189&format=png&auto=webp&s=6fbf5881dbfeac1ed3231628b469b1f0310e044b

https://preview.redd.it/swuz9jqkzq261.png?width=1188&format=png&auto=webp&s=cec5a79eeb80c4fb2f415075c3705f89bb37373c

Apparently there's a way to clear/purify this, but since I initially got to the area by spamming herbs I never figured out how it was supposed to be cleared. My question is: Was there an area/item I was supposed to backtrack towards to purify the water in this section.

Also, any general help/info about the Old Battlefield or the game generally would also be really helpful and appreciated.